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Tahmasebi F, Rezaloo R, Maroufi Aghdam E, Sarhadi L. (2024). “Clay processing Building” in Yelsuie Germi Castle, an Unknown Structure from the Middle Ages of Islam. Parseh J Archaeol Stud. 8(29), 129-152. doi:10.22034/PJAS.8.29.129
URL: http://journal.richt.ir/mbp/article-1-630-en.html

Abstract
Archaeological excavations in Yelsuie Germi Castle, very rich findings and valuable documents such as pottery, architecture and other handicrafts were identified and excavated from under a mound of soil that can play an important role in the detailed analysis of this area. One of these landmarks is an unknown structure with complex architecture and building elements located on the hills of the castle near the Sambur Chay River. This building has sections and spaces of four corners that the presence of water conduction paths into the building on the walls and water outlet channels in the floor, has increased the importance of the building and has made it more difficult to identify and evaluate the main function of the building. In this regard, the present research is descriptive-analytical and based on field studies and review of library documents, while identifying and introducing the mentioned building, seeks to find a logical answer to the following questions: What is the usage of the unknown building of Yelsuie Castle and how did it work? What era does the unknown building of Yelsuie Castle belong to? Studies were carried out show that the unknown building is due to the presence of ponds and inlets and outlets water conduction paths was in association with water usage, which is probably used for the preparation and processing of clay, and accordingly by the authors, The name of the building is called “clay processing building”. On the other hand, the study of pottery obtained from different spaces of this building and its comparison with other areas, confirms that this building belongs to the Islamic Middle Ages and the Seljuk period.
Keywords: Germi, Yelsuie Castle, Clay Processing Building, Pottery, Medieval Islam.

Introduction
The current research method is based on a descriptive-analytical and historical approach and its data collection is in the form of library and field studies and archaeological excavations in the area. According to this, at first, the whole building and its various spaces have been drawn, designed and three-dimensional with the help of various software; Also, in order to achieve the most accurate information and general analysis of the building, the obtained pottery from inside the brick building has been compared and matched with the pottery works of other areas of the Islamic era. The ancient place of Yelsuie Castle in the Ingot section of Germi city consists of a small castle on top of a high natural hill and a residential area located in its southwestern part. Yelsuie Castle is located in the watercourse of Sambur Chay River. Easy access to river water resources as well as the precipice situation in the southern and eastern part of the hill on which the castle was built, is one of the most important strategic features that has been influential in choosing this place to form such an area. In general, this area can be considered as one of the most key Islamic area in northwestern Iran. The brick building is located on the eastern side of the castle and on the watercourse of the Sambur Chay River. In this regard, in order to identify this brick building, a workshop called Workshop No. 4 was created in this part of the area by the excavation team. While continuing the excavation process, a brick building with special architecture and unknown usage was discovered. The mentioned building has an almost rectangular plan that includes several spaces inside. The main materials used in the structure of this building are bricks with gypsum and lime mortar, and in some parts, especially in the outer parts of the building, river rubble has been used. The walls of the brick building are completely smooth and flat and are made with an average width of 50 cm and the height of all of them is the same and is about 70 cm.

Discussion
In general, according to the general structure of the brick building, the most reasonable usage for this architecture is being a pottery workshop and processing and preparing clay in it. One of the most important steps before making pottery is to find the right clay or grinding clay, without clods and other materials. Therefore, for this purpose, it is necessary for the pottery clay to be well shaped, sifted, cleaned and prepared. It seems that small ponds that are embedded lengthwise in different parts of the brick building; Along with water inlet and outlet channels, they are made for just such a use.  In fact, in this building, water is directed into these ponds and collected in them through small canals that are embedded on the walls. After filling them, in the next stage, the clay, which was suitable for pottery, was mixed with water inside these basins and became a slurry. While mixing the clay with water, the water flow is redirected into these ponds again, and during this operation, the excess material inside of the soil as well as other additional materials are poured out of the ponds along with the excess water into large side spaces. And was led out  of the building by floor channels. Also, the grains of sand that may have been inside the clay, due to the weight of the bottom of the ponds and the parts that are embedded in the bottom of the floor, were deposited. After doing this, the water flow was cut off and the produced clay was deposited in the ponds for a few days and remained there until it was soft and smooth and so-called settled. After a few days, the prepared clay was collected and transferred to pottery workshops and then to pottery kilns. 

Conclusion
In fact, it should be added that the existence of various pottery in various forms, styles and techniques in Yelsuie Castle indicates the possible presence of pottery kilns in this site, which also confirms the fact that the brick building is a workshop for producing high quality clay. On the surface of Yelsuie Castle, there are limited traces of pottery balls that indicate the presence of pottery kilns in the area, so that with the help of these balls, the temperature of the kilns was regulated. In this article, 3 maps and 13 images including the castle itself, its geographical location, as well as the brick building and its various parts are given. Also, in two tables, the types of obtained pottery from the brick building are displayed, and in another table, similar samples of obtained pottery from other sites of the Islamic period in other parts of Iran have been compared and matched. According to potteries and other artifacts, the date and time of construction of this building should be belong to the Middle Ages of Islam and the Seljuk era.